Athletic mouthguard with novelty design on front portion



FIG. 1 is a front view of an athletic mouthguard with novelty design on front portion showing my new design;

FIG. 2 is a back view thereof;

FIG. 3 is a side view thereof, the opposite side view being a mirror image; and,

FIG. 4 is a top plan view thereof, the bottom plan view being a mirror image. 

The ornamental design for an athletic mouthguard with novelty design on front portion, as shown and described. 